The aim of this project is to examine procedural decision principles that will yield better choices in circumstances where, because of epistemic limitations, standard decision theory provides an inadequate guide. Individuals and policy-makers must make decisions even though they cannot be fully aware of all of the relevant possibilities or fully understand consequences they have not yet experienced. Examples include individual decisions about marriage and childbearing, public policy decisions about complex environmental problems and decisions on funding scientific research. The expected outcome of the project will be a formal model of decision theory incorporating principles of resilience, sustainability and transformative experience.